Writing instrument



FIG. 1 is a perspective view of a writing instrument according to the present invention;

FIG. 2 is a top view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is an enlarged end view thereof;

FIG. 5 is an enlarged other end view thereof;

FIG. 6 is a side view thereof; and,

FIG. 7 is an exploded side view thereof.

The broken lines showing environment in the drawings are for information purposes only and form no part of the claimed design. 

The ornamental design for a writing instrument, as shown and described. 